Allow for --force option when deregistering agents

This adds a --force option for the opentf-ctl delete agent command. It has no specific effect on previous orchestrator release, but it adds a force query parameter when calling the DELETE /agents/... endpoint.

This also adds more configuration options in the configuration file: a verbose option and a show-notifications option. If those options are set, it is as if the -v--verbose and -a--show-notifications options were set in the command line.

Those options can also be specified in the workflow header, so that the generated execution log shows the specified information (just like step depth and so are configurable) :

metadata:
    name: Test Workflow
    labels:
        live-executionlog/step-depth: '0'
        live-executionlog/job-depth: '0'
        live-executionlog/max-command-length: '0'
        live-executionlog/verbose: 'enabled' 
jobs:
    [...]

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